1/*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at https://curl.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 * SPDX-License-Identifier: curl 22 * 23 ***************************************************************************/ 24/* <DESC> 25 * Use CURLOPT_LOCALPORT to control local port number 26 * </DESC> 27 */ 28#include <stdio.h> 29#include <curl/curl.h> 30 31int main(void) 32{ 33 CURL *curl; 34 CURLcode res = CURLE_OK; 35 36 curl = curl_easy_init(); 37 if(curl) { 38 /* Try to use a local port number between 20000-20009 */ 39 curl_easy_setopt(curl, CURLOPT_LOCALPORT, 20000L); 40 /* 10 means number of attempts, which starts with the number set in 41 CURLOPT_LOCALPORT. The lowe value set, the smaller the change it will 42 work. */ 43 curl_easy_setopt(curl, CURLOPT_LOCALPORTRANGE, 10L); 44 curl_easy_setopt(curl, CURLOPT_URL, "https://curl.se/"); 45 46 res = curl_easy_perform(curl); 47 48 /* always cleanup */ 49 curl_easy_cleanup(curl); 50 } 51 52 return (int)res; 53} 54